Post-fledging movements, mortality and migration of juvenile northern gannets

Lane, Jude V.; Pollock, Christopher J.; Jeavons, Ruth; Sheddan, Maggie; Furness, Robert W.; Hamer, Keith C.

doi:10.3354/meps13804

Cited by 13 publications

(6 citation statements)

References 68 publications

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“…Among-natal region differences in movement behaviors could be linked to several non-mutually exclusive factors such as social transmission, where juveniles follow migrating adults [ 53 , 54 ], or landscape features that facilitate or impede flying in specific directions [ 55 ]. It might also be associated with the quality of the local environment.…”

Section: Discussionmentioning

confidence: 99%

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

et al. 2023

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Background As for other life history traits, variation occurs in movement patterns with important impacts on population demography and community interactions. Individuals can show variation in the extent of seasonal movement (or migration) or can change migratory routes among years. Internal factors, such as age or body condition, may strongly influence changes in movement patterns. Indeed, young individuals often tend to move across larger spatial scales compared to adults, but relatively few studies have investigated the proximate and ultimate factors driving such variation. This is particularly the case for seabirds in which the sub-adult period is long and difficult to follow. Here, we examine migration variation and the factors that affect it in a common Mediterranean seabird, the Yellow-legged gull (Larus michahellis). Methods The data include the encounter histories of 5158 birds marked as fledglings between 1999 and 2004 at 14 different colonies in southern France and resighted over 10 years. Using a multi-event mark-recapture modeling framework, we use these data to estimate the probability of movement and survival, taking into account recapture heterogeneity and age. Results In accordance with previous studies, we find that young individuals have greater mobility than older individuals. However, the spatial extent of juvenile movements depends on natal colony location, with a strong difference in the proportion of sedentary individuals among colonies less than 50 km apart. Colony quality or local population dynamics may explain these differences. Indeed, young birds from colonies with strong juvenile survival probabilities (~ 0.75) appear to be more sedentary than those from colonies with low survival probabilities (~ 0.36). Conclusions This study shows the importance of studying individuals of different ages and from different colonies when trying to understand seabird movement strategies. Local breeding success and the availability of food resources may explain part of the among colony differences we observe and require explicit testing. We discuss our results with respect to the feedback loop that may occur between breeding success and mobility, and its potential implications for population demography and the dissemination of avian disease at different spatial scales.

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Section: Discussionmentioning

confidence: 99%

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

et al. 2023

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“…Among-natal region differences in movement behaviors could be linked to several non-mutually exclusive factors such as social transmission, where juveniles follow migrating adults [49,50] or landscape features that facilitate or impede ying in speci c [51]. It might also be associated with the quality of the local environment.…”

Section: Discussionmentioning

confidence: 99%

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Souc

Sadoul²,

Blanchon³

et al. 2022

Preprint

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Background: As for other life history traits, variation occurs in movement patterns with important impacts on population demography and community interactions. Individuals can show variation in the extent of seasonal movement patterns (or migration) or can change migratory routes among years. Internal factors, such as age or body condition, may strongly influence changes in movement patterns. Indeed, young individuals often tend to move across larger spatial scales compared to adults, but relatively few studies have investigated the proximate and ultimate factors driving such variation. This is particularly the case for seabirds in which the sub-adult period is long and difficult to follow. Here, we examine migration variation and the factors that affect it in a common Mediterranean seabird, the Yellow-legged Gull (Larus michahellis). Methods: The data included the encounter histories of 5158 birds marked as fledglings between 1999 and 2004 at 14 different colonies in southern France and resighted over 10 years. Using a multi-event mark-recapture modeling framework, we used these data to estimate the probability of movement and survival, taking into account recapture heterogeneity and age. Results: In accordance with previous studies, we found that young individuals had greater mobility than older individuals. However, the spatial extent of juvenile movements depended on natal colony location, with a strong difference in the proportion of sedentary individuals between colonies less than 50 km apart. Colony quality or local population dynamics may explain these differences. Indeed, young birds from colonies with strong juvenile survival probabilities (~0.75) appeared to be more sedentary than those from colonies with low survival probabilities (~0.36). Conclusions: This study shows the importance of studying individuals of different ages and from different colonies when trying to understand seabird movement strategies. Local breeding success and the availability of food resources may explain part of the among colony differences we observed and require explicit testing. We discuss our results with respect to the feedback loop that may occur between breeding success and mobility, and its potential implications for population demography and the dissemination of avian disease at different spatial scales.

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“…this is a well-known hotspot for seabirds crossing over to African waters (leitão et al, 2014). Other nearby areas, such as the gulf of Cádiz and the Strait of Gibraltar, are also recognised as important within the gannet migratory range (Veron & lawlor, 2009;lane et al, 2021).…”

Section: Northern Gannet Distribution Modelsmentioning

confidence: 99%

Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys

Araújo

Rodrigues

Bastos-Santos

et al. 2022

Ardeola

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Several North Atlantic breeding seabirds, such as the Northern Gannet Morus bassanus, use Western Iberian Waters for wintering and migration. In this study, we aimed at producing absolute population estimates of post-breeding Gannets and evaluating the importance of the study area within the species' migration range. We performed six aerial surveys in September and/or October each year between 2010 and 2015, covering 74,840 km 2 in total. Using line transect methodology, 3,672 Gannet sightings were recorded along 10,496.3 nautical miles (nm). Immature individuals and adults comprised approximately 87% of all sightings. Using Distance sampling, overall abundance was estimated at 89,930 birds, ranging from 58,010 individuals in 2014 to 128,140 in 2015. the highest densities per sector areas were recorded in the North and Centre sectors whereas the lowest densities were registered in the Galicia sector, the Spanish region within the study area. Gannets were mostly present in shallow shelf waters of the continental shelf, particularly between 3 and 20 nautical miles offshore. habitat

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Post-fledging movements, mortality and migration of juvenile northern gannets

Cited by 13 publications

References 68 publications

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys

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